linux-kernel - Re: [PATCH net-next v3 6/9] xen-netback: Handle guests with too many frags

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <1389147141.26646.74.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Tue, 07 Jan 2014 18:12:21 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Zoltan Kiss <zoltan.kiss@...rix.com>
Cc:	ian.campbell@...rix.com, wei.liu2@...rix.com,
	xen-devel@...ts.xenproject.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, jonathan.davies@...rix.com
Subject: Re: [PATCH net-next v3 6/9] xen-netback: Handle guests with too
 many frags

On Wed, 2014-01-08 at 00:10 +0000, Zoltan Kiss wrote:

>  
> +		if (skb_shinfo(skb)->frag_list) {
> +			nskb = skb_shinfo(skb)->frag_list;
> +			xenvif_fill_frags(vif, nskb, INVALID_PENDING_IDX);
> +			skb->len += nskb->len;
> +			skb->data_len += nskb->len;
> +			skb->truesize += nskb->truesize;
> +			skb_shinfo(skb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
> +			skb_shinfo(nskb)->tx_flags |= SKBTX_DEV_ZEROCOPY;
> +			vif->tx_zerocopy_sent += 2;
> +			nskb = skb;
> +
> +			skb = skb_copy_expand(skb,
> +					0,
> +					0,
> +					GFP_ATOMIC | __GFP_NOWARN);

skb can be NULL here

> +			skb_shinfo(skb)->destructor_arg = NULL;
> +		}
>  		if (skb_is_nonlinear(skb) && skb_headlen(skb) < PKT_PROT_LEN) {
>  			int target = min_t(int, skb->len, PKT_PROT_LEN);
>  			__pskb_pull_tail(skb, target - skb_headlen(skb));
> @@ -1568,6 +1660,9 @@ static int xenvif_tx_submit(struct xenvif *vif)
>  		}
>  


--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/